bad-mouth
verbNAmE//ˈbædmaʊθ//, NAmE//ˈbædmaʊð//
bad-mouth somebody (informal)Verb Forms present simple I / you / we / they bad-mouth he / she / it bad-mouths
past simple bad-mouthed
-ing form bad-mouthing
Check pronunciation: bad-mouth
Definition of bad-mouth verb from the Oxford Advanced American Dictionary